1998 Grand Cherokee 4.0 Vacuum Leak - JeepForum.com
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post #1 of 6 Old 08-16-2013, 07:42 PM Thread Starter
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2001 WJ 
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1998 Grand Cherokee 4.0 Vacuum Leak

I have a problem and hope someone can help. I have replaced the exhaust manifold, gasket and cleaned the intake and the truck started great but suddenly it starter to sputter and discharge water and carbon residue from the muffler. I've been told that it could be vacuum lines but cannot see anything unusual. What I noticed is that a line that says "fuel" is loose. I do not know if this is a breather tube or what. Can someone guide me me without making fun of my lack of mechanical knowledge?

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post #2 of 6 Old 08-17-2013, 12:20 AM
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1999 WJ 
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Just a heads up, this is the WJ forum, you have a ZJ...

What did you clean your intake manifold with? Water from the tail pipe isn't a problem, it's a by-product of combustion (obviously unless it's pouring out), and there will be carbon buildup throughout your exhaust as well (same principal). Any idle fluctuations after a repair that wasn't present before said repair should be an easy fix. There are multiple vacuum lines on the intake manifold, did you check all of them? Is everything plugged in? Is the CEL on? I'm not sure what fuel line you're talking about, can you take a picture?

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post #3 of 6 Old 08-19-2013, 08:47 AM Thread Starter
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Hi, and thank you for your response. When I removed my intake manifold and the header to replace the header due to a crack (I was getting a "lean on Bank one" code and found a crack on my exhaust), I cleaned the intake with throttle body cleaner.

I have no check engine light on.

BTW I found out what those two lines went to, they go to the vapor canister that is located under the drivers side headlamp. It seems that this canister only has 2 connections and one is off. I noticed that the rubber connectors are all messed up and will go get something to replace these with so I have a good fitment to the canister. Could this be a reason for the weird idle and "sputtering" when the engine gets to operating temperature? or could these canisters go bad? or, again, can I just by-pass the canister and splice the lines together?

I am sorry if I have too many questions on the same post.

Thank you,

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post #4 of 6 Old 08-20-2013, 12:30 PM Thread Starter
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Well, the problem seems to be fixed!, I replaced the hose that goes from the vapor canister to the main line which was cracked and a test run seems to be running great. I just noticed a momemtary rough idle when stopping at a stop sign but it went back up to normal. This forum is awesome, I did what I should of done from the beginning to search through other posts and got most of the information needed.
Thanks to all!!! Now I just need new tires and to replace the rear crankshaft bearing but for the bearing I am going to a real mechanic because I am told it's not an easy job.

Thanks again to all.....

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post #5 of 6 Old 08-20-2013, 02:34 PM
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post #6 of 6 Old 08-20-2013, 10:45 PM
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Rough idle try cleaning the IAC on the throttle body ,

But any questions do be afraid to ask

"aut viam inveniam aut faciam"

I hate when old people poke me at weddings, point and whisper, "You're next." So I've started doing the same thing to them at funerals
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